MD Settings: Fix dragging slider bugging out the Enter key.

chrome/browser/resources/settings/controls/settings_slider.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * settings-slider wraps a paper-slider. It maps the slider's values from a
  * linear UI range to a range of real values.  When |value| does not map exactly
  * to a tick mark, it interpolates to the nearest tick.
  *
@@ skipping 118 matching lines @@
       var difference = Math.abs(arr[i] - value);
       if (difference < minDifference) {
         closestIndex = i;
         minDifference = difference;
       }
     }
 
     assert(typeof closestIndex != 'undefined');
     return closestIndex;
   },
+
+  /**
+   * TODO(scottchen): temporary fix until polymer gesture bug resolved. See:
+   * https://github.com/PolymerElements/paper-slider/issues/186
+   * @private
+   */
+  resetTrackLock_: function() {
+    Polymer.Gestures.gestures.tap.reset();
+  },
 });